JPS621390Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a turbocharged engine for a motorcycle, and more specifically to the arrangement of a supercharger, intake and exhaust valves, and intake and exhaust pipes of a turbocharged water-cooled engine for a motorcycle. .

b. Prior Art In order to improve engine output and response performance during acceleration, it has been proposed to attach a turbo supercharger to a motorcycle engine.

In a conventional example of such a turbocharged engine, as shown in FIG. Supercharger 2 to exhaust pipe 3
In addition, a water-cooled engine is connected to an intake valve (not shown) at the rear of cylinder 1, a turbocharger 2, and an intake pipe 4, and a turbosupercharger 2 as shown in Fig. 2 is placed behind cylinder 1. , as in the example shown in FIG. There are connected air-cooled engines.

c Problems that the invention attempts to solve However, in the case of the conventional example shown in Figure 1 above, the exhaust pipe 3
The output performance can be improved because the intake pipe 4 can be made shorter, but since the intake pipe 4 is located behind the cylinder 1, which has poor airflow, the high temperature air or air mixture pre-pressured by the compressor of the turbocharger 2 is cooled down. It has the drawback of being difficult to use and easily causing knotting.

In addition, in the case of the conventional example shown in Fig. 2 above, since it is an air-cooled engine, the exhaust pipe 3 is naturally placed on the side with good wind exposure in front of the cylinder 1, so the distance to the turbocharger behind the cylinder 1 is long. Therefore, there was a problem that we could not expect much improvement in output performance or engine response performance during acceleration.

The present invention was developed to effectively solve the above-mentioned problems, and its purpose is to reduce the exhaust gas pressure by shortening the passage from the cylinder exhaust valve to the turbine side of the turbocharger as much as possible. In addition to reducing losses, the passage from the blower side of the turbocharger to the intake valve of the cylinder is arranged so that it is effectively cooled by the running wind and the cooling water circulating in the cylinder head. There is a particular thing.

d Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a water-cooled engine for a motorcycle in which the axis of the cylinder is tilted forward with respect to the direction of travel of the vehicle. A turbo supercharger is disposed behind the turbo supercharger, an intake valve is disposed at the front of the upper end of the cylinder, and an exhaust valve is disposed at the rear of the upper end of the cylinder, so that the blower side of the turbo supercharger and the intake air An intake pipe that extends forward from the blower side and is exposed to the running wind; a cylinder head cover that is connected to the front end of the intake pipe and is exposed to the running wind; an exhaust passage extending rearward from the exhaust valve within the cylinder head and communicating with the turbine side of the turbocharger and the exhaust valve through an intake passage extending downward and reaching the intake valve; and an exhaust pipe connected to the rear end of the exhaust passage and reaching the turbine side.

e Function In the turbocharged engine of a motorcycle configured as described above, exhaust gas discharged from the exhaust valve is introduced into the turbine side of the turbocharger through the exhaust passage and exhaust pipe in the cylinder head. Ru. At this time, since the lengths of the exhaust passage and the exhaust pipe are substantially the shortest, the pressure loss of the exhaust gas pressure can be kept to a minimum. Further, the air-fuel mixture discharged from the blower side of the turbocharger is sucked into the intake valve of the cylinder through the intake pipe, the cylinder head cover, and the intake passage in the cylinder head. At this time, the intake pipe and the intake passage in the cylinder head cover are relatively well exposed to the wind from the vehicle, and cooling water is circulated around the intake passage in the cylinder head, so it is compressed on the blower side and becomes hot. The air-fuel mixture is effectively cooled before reaching the intake valve.

f. Example An example of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 shows a longitudinal section of a turbocharged water-cooled engine according to the present invention, and as shown in FIG. It is mounted tilted forward. Specifically, as shown in Fig. 3, the turbocharged engine has a forward-inclined cylinder 1, a cylinder head 1a attached to the upper end of this cylinder 1, and this cylinder head 1a.
a cylinder head cover 1b attached to the top of the cylinder head cover 1b;
Crankcase 1 attached to the lower end of cylinder 1
2.

An intake valve 5 is provided at the front of the cylinder head 1a, and an exhaust valve 6 is provided at the rear. A pair of tappet parts 5 of these intake and exhaust valves 5 and 6
a and 6a extend upward toward the upper end of the cylinder head 1a so as to form a V-shape, and the upper ends of the pair of tappet parts 5a and 6a abut against the pair of cams 16 and 17. . The pair of tappet portions 5a, 6a are always pressed against the pair of cams 16, 17 by a pair of springs 18, 19.

On the other hand, a turbo supercharger 2 is arranged behind the cylinder 1 . An intake pipe 4 extending forward and upward is connected to the blower side 2a of the turbocharger 2, and the front end of the intake pipe 4 communicates with an intake passage 7a formed in the cylinder head cover 1b. . This intake passage 7a is connected to the cylinder head cover 1.
The intake passage 7b extends diagonally forward and downward in the cylinder head 1a, extends downward at the rear, and is further communicated with an intake passage 7b formed substantially vertically between the pair of tappet parts 5a, 6a in the cylinder head 1a. .
The lower end of this intake passage 7b communicates with the intake valve 5,
Air-fuel mixture pressure-fed from the blower side of the turbocharger 2 is sucked into the cylinder 1 via the intake valve 5.

An exhaust passage 9 extending rearward from the exhaust valve 6 is formed in the cylinder head 1a. The rear end of this exhaust passage 9 is communicated with the turbine side 2b of the turbocharger 2 via the exhaust pipe 3 extending rearward from the cylinder head 1a, and the combustion exhaust gas discharged from the exhaust valve 6 is communicated with the turbine side 2b. It is configured to be introduced at approximately the shortest distance and drive the turbo supercharger 2.

In the figure, reference numeral 8 denotes a passage formed within the cylinder head 1a, through which cooling water is circulated. Further, 10 is a main exhaust pipe that communicates the turbocharger 2 and the muffler 11, 13 is a piston, 14 is a connecting rod, and 15 is a crankshaft.

The turbocharged engine is configured as described above, and the high-temperature, high-pressure air-fuel mixture forced from the blower side of the turbocharger 2 passes through the intake passages 7a and 7b and reaches the intake valve 5. The intake passage 7b can be cooled by the action of cooling water in a passage 8 provided around it, and the intake passage 7a is arranged with a slight inclination above the cylinder 1 where the intake passage 7a has good ventilation, as shown in the figure. This makes it possible to further improve cooling efficiency and prevent the knocking phenomenon that tends to occur in turbocharged engines.

In addition, since the exhaust valve 6 is communicated with the turbine side of the turbocharger 2 via the exhaust passage 9 and the exhaust pipe 3 through almost the shortest distance, the exhaust gas flows into the turbocharger 2 with minimal pressure loss. It is possible to reach this point, and of course it takes a very short time to reach that point, which improves exhaust efficiency, which in turn improves engine output, and also provides very good engine response performance during sudden acceleration.

g. Effect of the invention As mentioned above, the present invention has a turbocharger installed at the rear of the cylinder, an intake valve at the front of the upper end of the cylinder, and an exhaust valve at the rear of the upper end of the cylinder. A portion of the intake pipe and intake passage that communicates the blower side of the turbocharger with the above-mentioned intake valve is arranged above the cylinder head, which is easily cooled by the running wind, and the remaining part of the intake passage is placed in the cylinder head. Since the head is cooled by cooling water, the air-fuel mixture that is compressed at the blower side of the turbocharger and reaches a high temperature is effectively cooled while reaching the intake valve, resulting in engine knocking. can be prevented from occurring. In addition, since the exhaust valve and the turbine side of the turbocharger are communicated over almost the shortest distance through the exhaust passage and exhaust pipe, the pressure loss of the exhaust gas is kept to a minimum and the turbocharger is operated efficiently. In addition to improving exhaust efficiency, engine output and response performance during acceleration can be improved, and the weight can be reduced because the intake and exhaust pipes can be shortened.

In addition, the intake and exhaust pipes are placed in positions where they do not come into contact with the passengers, which prevents heat damage to people, and because the intake and exhaust pipes do not pass under the engine, the minimum ground clearance can be increased and damage to equipment can be prevented. It has the following useful effects.

[Brief explanation of the drawing]

Figures 1 and 2 are side views of main parts showing a conventional example;
3 and 4 show an embodiment of the present invention, in which FIG. 3 is a partially longitudinal side view of the engine section, and FIG. 4 is a side view of the entire vehicle body. 1... Cylinder, 2... Turbo supercharger, 3...
Exhaust pipe, 4...Intake pipe, 5...Intake valve, 6...Exhaust valve, 7a, 7b...Intake passage, 9...Exhaust passage.

Claims (1)

[Scope of utility model registration request] In a water-cooled motorcycle engine mounted with the axis of the cylinder inclined forward with respect to the direction of travel of the vehicle, a turbo supercharger is disposed at the rear of the cylinder, and an air intake is provided at the front of the upper end of the cylinder. and an exhaust valve at the rear of the upper end of the cylinder, and connect the blower side of the turbo supercharger and the intake valve to an intake pipe extending forward from the blower side and exposed to the running wind. , which is connected to the front end of the intake pipe and communicates with the cylinder head cover exposed to the traveling wind, and an intake passage extending forward and downward within the water-cooled cylinder head and reaching the intake valve, The turbine side of the turbocharger and the exhaust valve are connected by an exhaust passage extending rearward from the exhaust valve within the cylinder head, and an exhaust pipe connected to the rear end of the exhaust passage and reaching the turbine side. A turbocharged engine for a motorcycle, which is characterized by being connected to the engine.